<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>动画时间线-视图时间线</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        height: 3000px;
      }

      .box {
        position: sticky;
        top: 50px;
        width: 1000px;
        height: 500px;
        margin: 800px auto 0;
        /* background-color: pink; */
      }

      .box p {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        font-size: 30px;
      }

      .box .pic1 {
        position: absolute;
        top: 0;
        left: 0;
        width: 200px;
      }

      .box .pic2 {
        position: absolute;
        right: 0;
        bottom: 0;
        width: 200px;
      }

      .box img {
        opacity: 0.2;
        animation: anim 1s linear forwards;
        /* 绑定视图时间线 */
        animation-timeline: view();
      }

      /* 图片动画 */
      @keyframes anim {
        0% {
          transform: scale(1);
          opacity: 0.2;
        }

        100% {
          transform: scale(1.5);
          opacity: 1;
        }
      }
    </style>
  </head>

  <body>
    <div class="box">
      <p>专业哈苏人像</p>
      <img src="./img/mingxiang.png" alt="" class="pic1" />
      <img src="./img/mingxiang.png" alt="" class="pic2" />
    </div>
  </body>
</html>
